Update DataConverter to 1.21.8-RC1

Add a non-Vanilla converter which removes ENTITY fall_distance
entries if they are equal to 0.0. This fixes incorrectly
converted data before b6675e47ca

paper-server/patches/features/0015-Rewrite-dataconverter-system.patch

@@ -217,10 +217,10 @@ index 0000000000000000000000000000000000000000..515f6691c72ffa82ac8b92646768be7a
 +}
 diff --git a/ca/spottedleaf/dataconverter/minecraft/MCVersionRegistry.java b/ca/spottedleaf/dataconverter/minecraft/MCVersionRegistry.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..7b5803c8f8bf0b201f6862768cf6d6b6fa103b1e
+index 0000000000000000000000000000000000000000..d6b3d4079b4a48ff2883f6b77870f845fe005f47
 --- /dev/null
 +++ b/ca/spottedleaf/dataconverter/minecraft/MCVersionRegistry.java
-@@ -0,0 +1,487 @@
+@@ -0,0 +1,488 @@
 +package ca.spottedleaf.dataconverter.minecraft;
 +
 +import ca.spottedleaf.dataconverter.converters.DataConverter;
@@ -503,7 +503,8 @@ index 0000000000000000000000000000000000000000..7b5803c8f8bf0b201f6862768cf6d6b6
 +            4314,
 +            4420,
 +            4424,
-+            // All up to 1.21.7
++            4439,
++            // All up to 1.21.8-rc1
 +        };
 +        Arrays.sort(converterVersions);
 +
@@ -710,10 +711,10 @@ index 0000000000000000000000000000000000000000..7b5803c8f8bf0b201f6862768cf6d6b6
 +}
 diff --git a/ca/spottedleaf/dataconverter/minecraft/MCVersions.java b/ca/spottedleaf/dataconverter/minecraft/MCVersions.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..7a46f8fbc90f65a2bf849d2bec5709145b8e6458
+index 0000000000000000000000000000000000000000..e89c82a6c202eba82915e58e775ba2186eec6692
 --- /dev/null
 +++ b/ca/spottedleaf/dataconverter/minecraft/MCVersions.java
-@@ -0,0 +1,600 @@
+@@ -0,0 +1,601 @@
 +package ca.spottedleaf.dataconverter.minecraft;
 +
 +@SuppressWarnings("unused")
@@ -1311,6 +1312,7 @@ index 0000000000000000000000000000000000000000..7a46f8fbc90f65a2bf849d2bec570914
 +    public static final int V1_21_7_RC1           = 4436;
 +    public static final int V1_21_7_RC2           = 4437;
 +    public static final int V1_21_7               = 4438;
++    public static final int V1_21_8_RC1           = 4439;
 +
 +    private MCVersions() {}
 +}
@@ -9288,10 +9290,10 @@ index 0000000000000000000000000000000000000000..e1f7c0d7fd80556941bbba8018aa85e7
 +}
 diff --git a/ca/spottedleaf/dataconverter/minecraft/datatypes/MCTypeRegistry.java b/ca/spottedleaf/dataconverter/minecraft/datatypes/MCTypeRegistry.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..4888b386d0e7f0237c2fe416e9034658cba0f1b0
+index 0000000000000000000000000000000000000000..b641738d1c5461fdf480a2f35787ace0114c1d52
 --- /dev/null
 +++ b/ca/spottedleaf/dataconverter/minecraft/datatypes/MCTypeRegistry.java
-@@ -0,0 +1,367 @@
+@@ -0,0 +1,370 @@
 +package ca.spottedleaf.dataconverter.minecraft.datatypes;
 +
 +import ca.spottedleaf.dataconverter.minecraft.versions.*;
@@ -9652,9 +9654,12 @@ index 0000000000000000000000000000000000000000..4888b386d0e7f0237c2fe416e9034658
 +        V4311.register();
 +        V4312.register();
 +        V4314.register();
++        // V1.21.6
 +        V4420.register();
 +        V4421.register();
 +        V4424.register();
++        // V1.21.8
++        V4439.register(); // Fix https://github.com/PaperMC/DataConverter/commit/b6675e47ca068f152c3b648b3869fe63ca12b720
 +    }
 +
 +    private MCTypeRegistry() {}
@@ -26790,6 +26795,37 @@ index 0000000000000000000000000000000000000000..690794c0963a4935390b4830202cb6b7
 +
 +    private V4424() {}
 +}
+diff --git a/ca/spottedleaf/dataconverter/minecraft/versions/V4439.java b/ca/spottedleaf/dataconverter/minecraft/versions/V4439.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..64388cd5b2d4e30a94cd6b53d1ab1d8aca68fe14
+--- /dev/null
++++ b/ca/spottedleaf/dataconverter/minecraft/versions/V4439.java
+@@ -0,0 +1,25 @@
++package ca.spottedleaf.dataconverter.minecraft.versions;
++
++import ca.spottedleaf.dataconverter.converters.DataConverter;
++import ca.spottedleaf.dataconverter.minecraft.MCVersions;
++import ca.spottedleaf.dataconverter.minecraft.datatypes.MCTypeRegistry;
++import ca.spottedleaf.dataconverter.types.MapType;
++
++public final class V4439 {
++
++    private static final int VERSION = MCVersions.V1_21_8_RC1;
++
++    public static void register() {
++        MCTypeRegistry.ENTITY.addStructureConverter(new DataConverter<>(VERSION) {
++            @Override
++            public MapType convert(final MapType data, final long sourceVersion, final long toVersion) {
++                if (data.getDouble("fall_distance", -1.0) == 0.0) {
++                    data.remove("fall_distance");
++                }
++                return null;
++            }
++        });
++    }
++
++    private V4439() {}
++}
 diff --git a/ca/spottedleaf/dataconverter/minecraft/versions/V501.java b/ca/spottedleaf/dataconverter/minecraft/versions/V501.java
 new file mode 100644
 index 0000000000000000000000000000000000000000..da5731090c1de479b77d0d9a1b66d217f7f4eeb5

paper-server/patches/features/0034-Fix-spawners-converted-from-1.21.4-not-running-final.patch

@@ -1,31 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Spottedleaf <Spottedleaf@users.noreply.github.com>
-Date: Wed, 16 Jul 2025 10:25:44 -0700
-Subject: [PATCH] Fix spawners converted from 1.21.4 not running finalisation
- logic
-
-DataConverter incorrectly placed a fall_distance value with 0.0
-if the entity did not have a FallDistance entry. This results in the
-entity spawn data having 2 entries, which prevents finalisation
-logic from running.
-
-We can fix this by removing the fall_distance entry if it is 0.0.
-
-diff --git a/net/minecraft/world/level/SpawnData.java b/net/minecraft/world/level/SpawnData.java
-index 60144561b277a2e20b50b8257b6d5e5c792629ce..04b4b7a50353497c3e637590fa2503379c304304 100644
---- a/net/minecraft/world/level/SpawnData.java
-+++ b/net/minecraft/world/level/SpawnData.java
-@@ -37,6 +37,13 @@ public record SpawnData(CompoundTag entityToSpawn, Optional<SpawnData.CustomSpaw
-             entityToSpawn.remove("id");
-         }
- 
-+        // Paper start - fix already converted data
-+        // See https://github.com/PaperMC/DataConverter/commit/b6675e47ca068f152c3b648b3869fe63ca12b720
-+        if (entityToSpawn.getDoubleOr("fall_distance", -1.0) == 0.0) {
-+            entityToSpawn.remove("fall_distance");
-+        }
-+        // Paper end
-+
-         this.entityToSpawn = entityToSpawn;
-         this.customSpawnRules = customSpawnRules;
-         this.equipment = equipment;